Use of ultra-fine grain carbide material with good milling, cutting performance, high work efficiency; Have sufficient bending strength and wear resistance; High hardness, high wear resistance, high strength; Sharp , milling, hole and plate edge, surface clean, , no glitches. End Mill Engraving Bits Material: Cemented carbide color:gold+silver Diameter: 3.175mm Diameter: 2mm Overall Length: 38mm Suitable For:PCB,, CNC, Mould, pastic fiber, carbon fiber, super hard wood, circuit board, other precision parts processing. Package included 10 x End Mill Engraving Bits Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.